Pepper: Manifest refactoring in trusted plugin.

This lifts more manifest processing code out of the trusted plugin.
Specifically, instead of the trusted plugin receiving a PP_Var with the contents
of the manifest and making another method to create the manifest id, the
trusted plugin now simply receives the manifest ID directly.

BUG=239656

Review URL: https://codereview.chromium.org/287153006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271719 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed